Design and analysis of completely adiabatic tapered waveguides by conformal mapping

Ching Ting Lee, Mount Learn Wu, Lih Gen Sheu, Ping Lin Fan, Jui Ming Hsu

Research output: Contribution to journalArticlepeer-review

35 Citations (Scopus)


In this study, we propose a novel equivalent-waveguide concept to design the completely adiabatic tapered waveguides. The optimal combination of taper shape and refractive-index distribution in such ideal structures is obtained by applying a series of conformal mappings to transform a single-mode straight waveguide into an equivalent tapered configuration. In an ideal taper the curved phase-front effect verifies the constant V-number concept is insufficient for designing a tapered waveguide. Also, the beam propagation method combined with the conformal mapping method is used to analyze the characteristics of light propagation in ideal structures. Simulation results predict that in the ideal taper a perfect mode-size conversion can be achieved adiabatically.

Original languageEnglish
Pages (from-to)403-410
Number of pages8
JournalJournal of Lightwave Technology
Issue number2
Publication statusPublished - 1997 Feb

All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics


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